diff --git a/README.md b/README.md
index acd9f37a..39e3620c 100644
--- a/README.md
+++ b/README.md
@@ -187,5 +187,29 @@ echo ($transaction->isPaid() || $transaction->isAuthorized())?'Paid':'Not paid';
 
 ```
 
+### Failover gateway
+In the event of an outage, set the failover gateway like this:
+
+```
+use Paynl\Config;
+use Paynl\Transaction;
+
+require __DIR__ . '/vendor/autoload.php';
+
+Config::setTokenCode('AT-####-####');
+Config::setApiToken('****************************************');
+Config::setServiceId('SL-####-####');
+
+# Setting Failover gateway (for available cores, call Config::getCores())
+Config::setCore( Config::CORE2 );
+
+# Or for SDK versions lower then 1.6.7, use:
+Config::setApiBase('https://rest.achterelkebetaling.nl');
+
+$requiredArguments = []; // See: Start a transaction example
+$result = Transaction::start($requiredArguments);
+```
+
+
 ### Testing
 Please run ```vendor/bin/phpunit --bootstrap vendor/autoload.php  tests/``` to test the application
diff --git a/composer.json b/composer.json
index ec6bdab3..c193f6a9 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,6 @@
 {
   "name": "paynl/sdk",
-  "version": "1.6.6",
+  "version": "1.6.7",
   "require": {
     "php-curl-class/php-curl-class": "^8.3||^9.0",
     "ext-json": "*",
diff --git a/src/Config.php b/src/Config.php
index b0bd7090..7421aa02 100644
--- a/src/Config.php
+++ b/src/Config.php
@@ -11,6 +11,12 @@
  */
 class Config
 {
+    const CORE1 = 'https://rest-api.pay.nl';
+    const CORE1_TEXT = 'Pay.nl (Default)';
+    const CORE2 = 'https://rest.achterelkebetaling.nl';
+    const CORE2_TEXT = 'Achterelkebetaling.';
+    const CORE3 = 'https://rest.payments.nl';
+    const CORE3_TEXT = 'Payments.nl';
 
     /**
      * @var string The token code (AT-xxxx-xxxx)
@@ -70,9 +76,9 @@ class Config
     public static function getCores()
     {
         return [
-          'https://rest-api.pay.nl' => 'Pay.nl (Default)',
-          'https://rest.achterelkebetaling.nl' => 'Achterelkebetaling.nl',
-          'https://rest.payments.nl' => 'Payments.nl',
+          self::CORE1 => self::CORE1_TEXT,
+          self::CORE2 => self::CORE2_TEXT,
+          self::CORE3 => self::CORE3_TEXT,
         ];
     }
 
@@ -132,6 +138,15 @@ public static function setApiBase($apiBase)
         self::$apiBase = $apiBase;
     }
 
+    /**
+     * @param $core
+     * @return void
+     */
+    public static function setCore($core)
+    {
+        self::setApiBase($core);
+    }
+
     /**
      * @param string $paymentApiBase
      */